I think, in general, some people’s intense allegiances to their ideologies, can sometimes lead them to act in racist ways towards people they may disagree with...I believe that racism can come from any group or individual, whether intentional or not, no matter what side of the political spectrum they may reside on...
But, to more specifically answer your question, I have seen members of these groups act in racist ways towards both black AND white people...But I don’t think that makes these groups, as a whole, necessarily racist...